Polychromatic printing plate



-rics, ceramic objects, etc.

Patented Dec. 24, 1935 UNITED STATES PATENT OFFICE POLYCHROMATIC PRINTING PLATE SergeTchechonin, Paris, France No Drawing. Application January 28, 1935,

Serial No. 3,643

' '1 Claims.

. chromatic reproduction, Serial No. 609,994, flled May 7, 1932. More particularly this invention provides a printing plate consisting of one or more color masses arranged in a suitable design and which may be hard, or plastic to any degree. In use, either the plate or the object to be printed upon is coated with a suitable solvent and when the plate is applied to the object, the color design is transferred.

According to another feature oi the invention, the coloring masses used in the preparation oi the printing plate may have as the base or principal v ingredient, dextrin, gum-lac, artificial or natural tar, commercial gums, resins, and waxes, either singly or in compounds thereoi. The color masses may carry pigments which are of the current types, and have an adequate solvent which may consist of water, steam, alcohol, or any commercial solvent, according to the nature of the main ingredient or base.

The desired quantities of these several coloring masses are applied by hand, by a brush, or by other suitable means, in a fluid, semi-fluid, plastic, elastic, halt-hard, hard, pastel or pencil state,'or the like, upon any suitable backing, in order to obtain the pattern or design to be reproduced, thus forming the printing plate.

By the use oi the said plate, the polychromatic printing is eflected in a direct manner and in a single operation, upon articles or objects of all kinds, for instance upon paper, pasteboard, tab- In this manner, the artist's production itself forms the printing plate,

1 and this can be reproduced in any desired num- 50 Other objects and advantages will in part be stated and input be obvious upon examination of the following specification and claims.

In accordance with the invention, a certain number of coloring are prepared prefer ably by employinginallcasesthesamesubstance as a base or carrier, and adding any desired coloring pigments. Such coloring masses may be, as

desired, fluid, semi-fluid, elastic, plastic, half- I hard, hard or the like. This state of .the mass will depend upon the quantity of the solvents employed in its preparation. A fluid mass'can be transformed into a plastic mass by treating it for a certain time at a determined temperature in order to eliminate the excess of solvents.

For the preparation 01' a printing plate, the various masses are employed in the same manner as ordinary colors. The desired amount of each mass is placed by the brush, or directly by hand, or by any other means, upon any suitable backing or support, which may consist of paper, tissue, 15

pasteboard or the like, thus iorming the pattern or design which is to be reproduced. The thickness of the layer placed upon the backing may vary at will. When the design is finished, it is dried, and may for this purpose be subjected to the action of heat. This forms the printing plate which serves for the polychromatic reproduction.

The fabric, paper or the like, upon which the printing is to be eflected, is covered with a layer of as many copies as desired.

The proper quantities of coloring masses used on the printing plate may as above stated be placed on the latter by hand, by the brush, or in any other manner. The fluid or semi-fluid masses are put on by thebrush. As concerns the plastic, elastic, half-hard, hard or other masses, these are adapted to produce certain particular surface effects, such as marbled surfaces, foliated suri'aces, granular surfaces, or the like. The foliated parts of .the image or pattern may be preliminarily prepared by hand or by machine, and optionally in molds, and may consist of superposed thin sheets ot a plastic substance. The hard mass may be ground, and grains of a uniform or a variable size may be incorporated into the plastic, semi-fluid, fluid or other masses, and this will form the granular parts of the image. The marbled parts can be formed by superposing sheets of masses or diiierent colors, and by sub jecting them to a mechanical action, such as pressm'e, or by mixing suitable of various natures and then rolling them into sheets, or in any other manner.

An alcohol soluble mass may have the following composition:

Gum-lac 100 grams Soap 15 grams Linseed oil 15 grams Egg yo: I 10 grams Naphthaline 4 grams 'Acetic acid 5 grams Glyc rin grams Alcohol, 90 V litre Any suitable pigment, even metallic, may be added in any proportion.

The method of preparation of masses of this class is as follows: The gum-lac is first dissolved in the alcohol; the total amount of the pigment, naphthaline, soap, oil and acetic acid, is then added to the gum-lac solution. The whole is boiled until it becomes sufilciently thick, and is then somewhat cooled, then adding the glycerin and heating to 60-80 C. for-a sumciently long time, while stirring, but without any abrupt movements, in order that no air bubbles shall enter the mixture.

When the mass has reached a certain consistency, the egg-yolk previously beaten with alcohol so as to form a homogeneous mass is added. The mass is then cooled, and is ready for use.

It is often important, in order to prepare a I printing plate, to dilute a color, or to employ a colorless mass upon a part of the said plate, in order to obtain reproductions of graduated tints, and regions without color. The said colorless mass may have the following compositions:

Gum-lac 50 grams White alcohol varnish litre Liquid soap 25 grams Linseed oil grams Acetic acid 5 grams Talc, or potato flour grams The method of preparation is analogous to that of the former coloring masses.

When the printing plate has been thus 'produced, the printing is performed as usual by placing said plate in the known machines, or in like manner.

The plate or the object which is to receive the reproduction may be covered with the solvent, by using spraying means, a roller, or in any other suitable way. It should be observed that owing to a more or less prolonged action of heat, it is possible to obtain at will a more or less elastic plate or a hard plate. The elastic plate is specially adapted for printing upon objects having a concave or a convex shape.

The thickness of the plate will depend upon the nature of the object on which the printing is to be effected, and upon the number of reproductions to be made. Old and hardened plates'may be employed, provided they are subjected to the action of solvent vapors in order to render them elastic.

Gum-lac 50 grams White alcohol varnish; 1; litre 15 Soap grams Linseed oil 15 grams Acetic a 5 grams Ta 20 grams Plgment--. desired quantity 2o 3. A printing plate for polychromatic reproduction which comprises ingredients in. substantially the following proportion:

Gum-lac 50 grams 25 White alcohol varnish A litre Soap- 25 grams Linseed oil 15 grams Acetic acid 5 grams Potato fiour 20*grams 80 Pigment desired quantity 4. A printing plate for polychromatic reproduction which comprises ingredients in substantially the following proportion:

Gum-lac -1 100 grams Soap 15 grams Linseed oil 15 grams Naphthaline 4 grams Acetic acid 5 grams 40 Glycerine 10 grams. Alcoho 3 litre Pigment desired, quantity 5. A printing plate for polychromatic reproduction which comprises ingredients in substantially the following proportion:

Gum-lac 100 grams Soap 15 grams Linseed oil 15 grams 12g yolk 10 grams Naphthaline 4 grams Acetic acid 5 grams Glycerine 10 grams Alcohol Y litre Pigment desired quantity 6. A printing plate for polychromatic reproduction comprising an alcohol soluble base, a saponified fatty substance and a pigment.

7. A printing plate for polychromatic reproduction comprising an alcohol soluble base, a saponified fatty substance, an inert filler, and a pigment.

sands 'rcrmcnonm. 

